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CMAS + sea salt corrosion to thermal barrier coatings

Corrosion Science 2023年第1期218卷

作者： Guo, Lei Zhang, Xinmu Liu, Mingguang Yang, Shuo Dai, JianWei School of Materials Science and Engineering Tianjin University Tianjin300072 China Tianjin Key Laboratory of Advanced Joining Technology Key Lab of Advanced Ceramics and Machining Technology of Ministry of Education Tianjin300072 China Naval Logistics Academy Tianjin300450 China Center for analysis and Test Tianjin University 300072 China Key laboratory for advanced corrosion and protection of aviation materials AECC Beijing Institute of Aeronautical Materials Beijing100095 China

In marine environment, sea salt and calcium-magnesium-alumina-silicate (CMAS) coexist largely endangering thermal barrier coatings (TBCs) service safety. In this study, the corrosion behavior of synthetic sea salt and CMAS to TBCs was investigated. Sea salt changed the CMAS structure, thereby decreasing its melting temperature and high-temperature viscosity. At 1200 ℃, CMAS + sea salt completely melted but CMAS did not;at 1250 ℃, both melted while CMAS + sea salt had stronger penetration ability in TBCs than CMAS. Thus, TBCs which have not been or are less affected by CMAS may be damaged due to CMAS + sea salt attack. © 2023 Elsevier Ltd

关键词： Alumina

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Vparrot Optimization Algorithm for Improved Multi-Strategy Fusion for Feature Optimization of Data in Medical and Industrial Field

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SSRN 2024年

作者： Huang, Gaoxia Wei, Jianan Yuan, Yage Huang, Haisong Chen, Hualin Key Laboratory of Advanced Manufacturing Technology Ministry of Education Guizhou University Guizhou Guiyang550025 China Guizhou Equipment Manufacturing Digital Workshop Modeling and Simulation Engineering Research Center Guizhou Guiyang550025 China

Feature selection is crucial in enhancing model performance in machine learning, data mining, and pattern recognition. In the medical-industrial domain, data often contains redundant and irrelevant features, impacting model efficiency and generalization. Meta-heuristic algorithms have shown superior performance in addressing complex problems with constraints, making them suitable for feature selection *** study proposes an improved Multi-Strategy Fusion Parrot Optimization algorithm (MIPO) tailored for optimizing feature selection. MIPO integrates four core mechanisms: balanced foraging behavior for pinpointing key features, lens imaging reverse dwell behavior for local search enhancement, vertical and horizontal cross-communication for population co-evolution, and memory-guided behavior for intelligent search direction. A pacifying behavior strategy enhances algorithm stability in complex *** study conducts exhaustive experiments, including ablation studies against mainstream algorithms, to validate MIPO's performance across various dimensions. Using the S/V transfer function, nine binary variants address diverse feature selection challenges. Results on 23 medical-industrial datasets demonstrate MIPO's efficiency and strong generalization *** integrated with KNN, SVM, and RF classifiers, MIPO significantly enhances model accuracy compared to the original parrot algorithm: 55.38%, 35.53%, and 49.59% on average, respectively. The optimal MIPO variant performs well across all classifiers, with average improvement rates of 53.91%, 34.38%, and 49.94%.This research underscores MIPO's broad applicability and robustness in feature selection for medical engineering applications. It provides empirical evidence supporting MIPO as a powerful tool for processing and analyzing complex datasets, thereby advancing feature selection technology in practical settings. © 2024, The Authors. All rights reserved.

关键词： Feature Selection

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Brain Functional Network Generation Using Distribution-Regularized Adversarial Graph Autoencoder with Transformer for Dementia Diagnosis

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Computer Modeling in Engineering & Sciences 2023年第12期137卷 2129-2147页

作者： Qiankun Zuo Junhua Hu Yudong Zhang Junren Pan Changhong Jing Xuhang Chen Xiaobo Meng Jin Hong School of Information Engineering Hubei University of EconomicsWuhan430205China State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin China Institute of Water Resources and Hydropower ResearchBeijing100038China School of Computing and Mathematic Sciences University of LeicesterLeicesterLE17RHUK Shenzhen Institutes of Advanced Technology Chinese Academy of SciencesShenzhen518055China Faculty of Science and Technology University of MacaoMacao999078China School of Geophysics Chengdu University of TechnologyChengdu610059China Laboratory of Artificial Intelligence and 3D Technologies for Cardiovascular Diseases Guangdong Provincial Key Laboratory of South China Structural Heart DiseaseGuangdong Provincial People’s Hospital(Guangdong Academy of Medical Sciences)Southern Medical UniversityGuangzhou519041China Medical Research Institute Guangdong Provincial People’s Hospital(Guangdong Academy of Medical Sciences)Southern Medical UniversityGuangzhou519041China

The topological connectivity information derived from the brain functional network can bring new insights for diagnosing and analyzing dementia *** brain functional network is suitable to bridge the correlation between abnormal connectivities and dementia ***,it is challenging to access considerable amounts of brain functional network data,which hinders the widespread application of data-driven models in dementia *** this study,a novel distribution-regularized adversarial graph auto-Encoder(DAGAE)with transformer is proposed to generate new fake brain functional networks to augment the brain functional network dataset,improving the dementia diagnosis accuracy of data-driven ***,the label distribution is estimated to regularize the latent space learned by the graph encoder,which canmake the learning process stable and the learned representation ***,the transformer generator is devised to map the node representations into node-to-node connections by exploring the long-term dependence of highly-correlated distant brain *** typical topological properties and discriminative features can be preserved ***,the generated brain functional networks improve the prediction performance using different classifiers,which can be applied to analyze other cognitive *** on the Alzheimer’s Disease Neuroimaging Initiative(ADNI)dataset demonstrate that the proposed model can generate good brain functional *** classification results show adding generated data can achieve the best accuracy value of 85.33%,sensitivity value of 84.00%,specificity value of 86.67%.The proposed model also achieves superior performance compared with other related ***,the proposedmodel effectively improves cognitive disease diagnosis by generating diverse brain functional networks.

关键词： Adversarial graph encoder label distribution generative transformer functional brain connectivity graph convolutional network dementia

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Review of electrochemical degradation of phenolic compounds

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International Journal of Minerals,Metallurgy and Materials 2021年第9期28卷 1413-1428页

作者： You Xue Xi Hu Qian Sun Hong-yang Wang Hai-long Wang Xin-mei Hou Beijing Advanced Innovation Center for Materials Genome Engineering Collaborative Innovation Center of Steel TechnologyUniversity of Science and Technology BeijingBeijing 100083China State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental SciencesBeijing 100012China State Environmental Protection Key Laboratory of Environmental Planning and Policy Simulation Chinese Academy of Environmental PlanningBeijing 100012China School of Materials Science Engineering Zhengzhou UniversityZhengzhou 450001China

Phenolic compounds are widely present in domestic and industrial sewage and have serious environmental *** oxidation(EO)is one of the most promising methods for sewage degradation because of its high efficiency,environmental compatibility,and *** this work,we present an in-depth overview of the mechanism and factors affecting the degradation of phenolic compounds by *** particular,the effects of treatment of phenolic compounds with different anode materials are discussed in *** non-active anode shows higher degradation efficiency,less intermediate accumulation,and lower energy consumption than the active *** combined with other treatment methods(biological,photo,and Fenton)presents advantages,such as low energy consumption and high degradation ***-while,the remaining drawbacks of the EO process in the phenolic compound treatment system have been ***,future re-search directions are put forward to improve the feasibility of the practical application of EO technology.

关键词： electrochemical oxidation phenolic compounds degradation mechanism anode material

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Research on the Configuration and Capacity Calculation of DC Side Dynamic Braking System

Research on the Configuration and Capacity Calculation of DC...

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HVDC (HVDC), International Conference on

作者： Yu Bai Yuexi Yang Xiao Zhou Zhenyu Du Yinghong Hu Yu Li National Key Laboratory of Advanced Power Transmission Technology Beijing Key Laboratory of DC Grid Technology and Simulation State Grid Smart Grid Research Institute Co. Ltd. Beijing China Electric Power Research Institute State Grid JiBei Electric Power Co. Ltd. Beijing China

ISBN: (数字)9798350387759

ISBN: (纸本)9798350387766

The Flexible DC Transmission technology circumvents the limitation of transmission distance caused by the charging power of AC cables. Additionally, it boasts technical advantages such as effectively isolating the interactions between onshore AC power grids and offshore wind farms, providing stable grid-connected voltage for offshore wind farms, and enabling flexible regulation of system operations. These factors make it the preferred technology for transmitting power from remote offshore wind farms. The offshore wind power flexible grid-connected system incorporates a DC-side dynamic braking system, which functions to absorb excess power injected by the wind farm and prevent system overvoltage when the AC main grid malfunctions, leading to the inability of the onshore converter station to deliver rated power. In this paper, the technical route, configuration scheme and capacity demand of DC side dynamic braking systems are studied, and the DC side dynamic braking system configuration scheme applicable to unipolar and bipolar isolated island new energy transmission flexible system is proposed, and the capacity demand of DC side dynamic braking system is analyzed, and the capacity design scheme of DC side dynamic braking system that conforms to the national calibration and meets the demand of system power balancing and fault ride-through and other requirements under the faulty AC system is proposed. The capacity design scheme of energy consuming devices is proposed in compliance with national calibration and can meet the system power balance and fault ride-through requirements in case of AC system failure and other working conditions.

关键词： HVDC transmission Systems operation Power system dynamics Layout Wind farms Power system stability Wind power generation Calibration Voltage control Standards

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Lightweight and Covalent-Crosslinked Polybenzoxazine Aerogels for Fire Resistance and Thermal Insulation

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SSRN 2024年

作者： Li, Liangjun Zhou, Jinlong Xiao, Yunyun Zeyu, Li Liu, Saihui Zhang, Sizhao Feng, Jian Science and Technology on Advanced Ceramic Fibers and Composites Laboratory College of Aerospace Science and Technology National University of Defense Technology Changsha410073 China International Institute for Innovation Jiangxi University of Science and Technology Jiangxi Nanchang330013 China Jiangxi Provincial Key Laboratory for Simulation and Modelling of Particulate Systems Jiangxi Nanchang330013 China

The rapid advancement of modern industry and aerospace has imposed demands on thermal insulators to possess not only efficient isolation but also multifunctionality. Polybenzoxazine (PBz) aerogels with several advantages have garnered considerable research interests in recent years. Nevertheless, PBz aerogels acquired from ambient pressure drying still confront the challenge of exhibiting relatively high densities and thermal conductivities. Herein, to enrich the category and provide ideas for overcoming the above plight, hexamethylene diisocyanate (HDI) was chosen as an additive to achieve the chemical modification of the PBz aerogels. The chemical structure characterization shown that a successful reaction was occurred between the isocyanates and the hydroxyl groups, forming a urethane-bridged structure between two PBz molecular chains. In this paper, the effect of introducing HDI on the physical and thermal insulation properties of the aerogels was investigated. The HDI-modified PBz (PBz-HDI) aerogels demonstrated lower densities (0.237–0.256 g·cm−3) and thermal conductivities (0.0354−0.0370 W·m−1·K−1) in comparison with the pristine aerogel. In addition, despite an observed reduction in the residual char yields in the PBz-HDI groups, the introduction of HDI has been demonstrated to not impact their superior intrinsic flame retardancy. Given such commendable properties, PBz-HDI aerogel is expected to be a promising candidate for thermal insulation and fire resistance applications in various domains. © 2024, The Authors. All rights reserved.

关键词： Thermal insulation

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Urban constructed wetlands: Assessing ecosystem services and disservices for safe, resilient, and sustainable cities

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Frontiers of Engineering Management 2023年第4期10卷 582-596页

作者： Aamir Mehmood SHAH Gengyuan LIU Yu CHEN Qing YANG Ningyu YAN Feni AGOSTINHO Cecilia MVBALMEIDA Biagio FGIANNETTI State Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentBeijing Normal UniversityBeijing 100875China Beijing Engineering Research Center for Watershed Environmental Restoration&Integrated Ecological Regulation Beijing 100875China Advanced Interdisciplinary Institute of Environment and Ecology Beijing Normal UniversityZhuhai 519087China Key Laboratory for City Environmental Safety and Green Development of the Ministry of Education Institute of Environmental and Ecological EngineeringGuangdong University of TechnologyGuangzhou510006China Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou) Guangzhou511458China State Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentBeijing Normal UniversityBeijing100875China Programa de Pós-graduação em Engenharia de Produção Laboratório de Produção e Meio AmbienteUniversidade Paulista(UNIP)São Paulo04026-002Brazil

Climate change and rapid urbanization are pressing environmental and social concerns, with approximately 56% of the global population living in urban areas. This number is expected to rise to 68% by 2050, leading to the expansion of cities and encroachment upon natural areas, including wetlands, causing their degradation and fragmentation. To mitigate these challenges, green and blue infrastructures (GBIs), such as constructed wetlands, have been proposed to emulate and replace the functions of natural wetlands. This study evaluates the potential of eight constructed wetlands near Beijing, China, focusing on their ecosystem services (ESs), cost savings related to human health, growing/maintenance expenses, and disservices using an emergy-based assessment procedure. The results indicate that all constructed wetlands effectively purify wastewater, reducing nutrient concentrations (e.g., total nitrogen, total phosphorus, and total suspended solids). Among the studied wetlands, the integrated vertical subsurface flow constructed wetland (CW-4) demonstrates the highest wastewater purification capability (1.63E+14 sej/m^(2)/yr) compared to other types (6.78E+13 and 2.08E+13 sej/m^(2)/yr). Additionally, constructed wetlands contribute to flood mitigation, groundwater recharge, wildlife habitat protection, and carbon sequestration, resembling the functions of natural wetlands. However, the implementation of constructed wetlands in cities is not without challenges, including greenhouse gas emissions, green waste management, mosquito issues, and disturbances in the surrounding urban areas, negatively impacting residents. The ternary phase diagram reveals that all constructed wetlands provide more benefits than costs and impacts. CW-4 shows the highest benefit-cost ratio, reaching 50%, while free water surface constructed wetland (CW-3) exhibits the lowest benefits (approximately 38%), higher impacts (approximately 25%), and lower costs (approximately 37%) compared to other we

关键词： constructed wetland emergy ecosystem services disservices ternary diagram

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应变梯度引起的极化畴结构减少铁电材料脆性

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Acta Mechanica Sinica 2023年第5期39卷 13-18页

作者：陈玉峻王鸿宇楼旭辉郭浩李晓雁王清远范海冬田晓宝 MOE Key Laboratory of Deep Earth Science and Engineering College of Architecture and EnvironmentSichuan UniversityChengdu610065China Department of Mechanics Sichuan UniversityChengdu610065China School of Urban Construction Material Simulation and Computing LaboratoryHebei Normal University of Science&TechnologyQinhuangdao066004China Center for Advanced Mechanics and Materials Applied Mechanics LaboratoryDepartment of Engineering MechanicsTsinghua UniversityBeijing100084China

铁电材料的力电耦合特性以及在纳米尺度的快速失效导致其剪切过程很难研究,而材料的脆性也限制了这些材料在铁电器件中的潜在应用.在这项工作中,我们使用分子动力学方法模拟了剪切和畴演变的动态过程,揭示了这些畴结构如何影响材料的力... 详细信息

铁电材料的力电耦合特性以及在纳米尺度的快速失效导致其剪切过程很难研究,而材料的脆性也限制了这些材料在铁电器件中的潜在应用.在这项工作中,我们使用分子动力学方法模拟了剪切和畴演变的动态过程,揭示了这些畴结构如何影响材料的力电性能.在原子尺度上,一个明显的极化旋涡状的畴结构出现在剪切带的尖端,两侧分别有180°和90°的畴壁.由应变梯度引起的挠曲电效应导致了这些复杂的畴结构.施加外部电场阻碍畴的翻转,并通过减少积累的能量减少了失配应变区域,加速了剪切过程.结果表明极化旋涡畴阻碍了剪切破坏过程,这启示我们可以通过设计畴结构来增韧铁电材料.

关键词： Ferroelectric toughening Molecular dynamics Vortex domain structure Strain gradient

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Phenomenon of acoustic resonance induced by the wake shedding vortex of the plate in a flow duct 27

Phenomenon of acoustic resonance induced by the wake sheddin...

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27th International Congress on Sound and Vibration, ICSV 2021

作者： Fengtong, Zhao Mingsui, Yang Jianfei, Chen Yundong, Sha Deyou, Wang Liaoning Province Key Laboratory of Advanced Measurement and Test Technology of Aviation Propulsion Systems Shenyang Aerospace University Shenyang China Corporation of China Shenyang China

ISBN: (纸本)9788378807995

The acoustic resonance in turbofan engines compressor stage as a special phenomenon which is caused by unsteady flow not only produces high intensity sound waves but also seriously damages engine structures. Acoustic resonance is sporadic and the risk of engine damage occurs simultaneously due to the non-uniform swirling flow, the varying geometry of the pipeline, the reflection and transmission of the sound wave between multistage blade rows and the high intensity aerodynamic loads. It is still impossible to simulate the complete process of the pressure disturbance aerodynamic evolution based on the unsteady method due to the unacceptable computational cost in the multistage compressor. Therefore, it is a feasible way to introduce the simplified model on the investigation of the acoustic resonance mechanism and influence factors. In the paper, a numerical simulation method is developed for Parker resonance and the acoustic resonance phenomena which is induced by the wake shedding vortex of the plate in a flow duct. The evolution rule of the wake shedding vortex of the plate and the criterion of the acoustic resonance are confirmed. The characteristic of frequency lock-in and phase locked is captured when Parker resonance occurs. And the calculated acoustic resonance frequency is about 3.6% different from the experimental results. An effective means is provided for the study of the acoustic resonance phenomenon from the computational model. The model can also enrich the existing the acoustic resonance model of the compressor, and provide model support for the analysis of the structural vibration failure under the coupling condition of the flow, the sound and the structure in the compressor. © "Advances in Acoustics, Noise and Vibration - 2021" Proceedings of the 27th International Congress on Sound and Vibration, ICSV 2021. All rights reserved.

关键词： Turbofan engines

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Towards Three-dimensional Mapping of Skyrmionic Spin Textures in an FeGe Nanodisk Using Off-axis Electron Holography

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Microscopy and microanalysis : the official journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada 2023年第1期29卷 1396-1397页

作者： Zheng, Fengshan Caron, Jan Savchenko, Andrii S. Wang, Shasha Wang, Weiwei Denneulin, Thibaud Kovács, András Du, Hongchu Du, Haifeng Kiselev, Nikolai S. Blügel, Stefan Dunin-Borkowski, Rafal E. Electron Microscopy Center School of Physics and Optoelectronics State Key Laboratory of Luminescent Materials and Devices Guangdong-Hong Kong-Macao Joint Laboratory of Optoelectronic and Magnetic Functional Materials South China University of Technology Guangzhou China Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons and Peter Grünberg Institute Forschungszentrum Jülich Jülich Germany Peter Grünberg Institute and Institute for Advanced Simulation Forschungszentrum Jülich and JARA Jülich Germany Anhui Key Laboratory of Condensed Matter Physics at Extreme Conditions High Magnetic Field Laboratory Chinese Academy of Sciences Hefei Anhui China Information Materials and Intelligent Sensing Laboratory of Anhui Province Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of Education Institutes of Physical Science and Information Technology Anhui University Hefei China

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